he would repeal the alternative minimum tax and permanently repeal the estate tax. the nonpartisan tax policy center concluded that mitt romney's tax plan would cost $4.8 trillion over ten years. romney said again tonight that his plan would be paid for, but to pay for those cuts, he would have to close loopholes in the tax code and get rid of some tax deductions, he said, and credits, but he's repeatedly refused to say which deductions he would get rid of saying that he would work with congress to make those decisions. also tonight president obama said his plan would cut the deficit by $4 trillion. >> we all know that we've got to do more, and so i put forward a specific $4 trillion deficit reduction plan. it's on a website. you can look at all the numbers, what cuts we make and what revenue we raise. >> reporter: that estimate comes from the left-leaning center on budget and policy priorities. $3.8 trillion, to be exact, over ten years. the president is counting money saved by letting the bush tax cuts expire for people making more than $250,000 a year, but he's a